• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>New Journal of Chemistry >Phosphine-free synthesis of ZnSe:Mn and ZnSe:Mn/ZnS doped quantum dots using new Se and S precursors
【24h】

Phosphine-free synthesis of ZnSe:Mn and ZnSe:Mn/ZnS doped quantum dots using new Se and S precursors

机译：使用新的Se和S前体无磷合成ZnSe：Mn和ZnSe：Mn / ZnS掺杂的量子点

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

ZnSe:Mn and core-shell ZnSe:Mn/ZnS doped quantum dots (d-dots) have been synthesized by using the alkylamine-H2Se complex and thiourea as new phpsphine-free Se and S precursors, respectively. Absorption spectroscopy, steady-state (solution and solid-state) and time-resolved photoluminescence spectroscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy were used to characterize the resulting d-dots. Results showed that Mn~(2+) was successfully doped and mainly dis-tributed in the middle layer of the actual ZnSe/ZnSe:Mn/ZnSe d-dots and ZnSe/ZnSeS:Mn/ZnS d-dots which were simply referred to as ZnSe:Mn and core-shell ZnSe:Mn/ZnS d-dots with ZnSe and ZnS outmost shells, respectively. The increase in the intensity of phosphorescence from the dopant Mn~(2+) was obtained by the corresponding injection of Zn precursor or Zn/S precursors for ZnSe or ZnS shell growth. As compared to the ZnSe shell, the ZnS shell was grown more significantly on the surface of the ZnSe:Mn core, which led to larger d-dots due to a thicker ZnS shell and thus deeper doping of Mn~(2+) in the larger host. Outstanding improvement has been achieved in both phosphorescence intensity and stability after growth of the ZnS shell relative to the ZnSe shell. The corresponding phosphorescence efficiency of the resulting d-dot cyclohexane solution was enhanced from about 8% for the ZnSe:Mn d-dots to 35% for the ZnSe:Mn/ZnS d-dots.
机译：ZnSe：Mn和核壳ZnSe：Mn / ZnS掺杂的量子点（d-dots）分别通过使用烷基胺-H2Se络合物和硫脲作为无phpsphine的新型Se和S前驱体合成。吸收光谱，稳态（溶液和固态）和时间分辨光致发光光谱，能量色散X射线光谱和透射电子显微镜用于表征所得的d点。结果表明，Mn〜（2+）被成功掺杂并主要分布在实际简称为ZnSe / ZnSe：Mn / ZnSe d-dots和ZnSe / ZnSeS：Mn / ZnS d-dots的中间层。分别为ZnSe：Mn和ZnSe：Mn / ZnS核壳d点，分别具有ZnSe和ZnS最外壳。通过为ZnSe或ZnS壳生长相应注入Zn前体或Zn / S前体，获得了来自掺杂剂Mn〜（2+）的磷光强度的增加。与ZnSe壳层相比，ZnS壳层在ZnSe：Mn核的表面上生长更为显着，这是由于ZnS壳层较厚，从而导致Mn〜（2+）掺杂较深，导致更大的d点。较大的主机。相对于ZnSe壳，在ZnS壳生长后，磷光强度和稳定性都得到了显着改善。所得d-点环己烷溶液的相应磷光效率从ZnSe：Mn d-点的约8％提高到了ZnSe：Mn / ZnS d-点的35％。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号